int main(int argc, char **argv) {
if(argc<2) {
printf("MSN Sniffer v1 Coded by Amir Canto\n");
printf("usage: %s <ethernet interface>",argv[0]);
} else {
SOCKET sock;
SOCKADDR_IN sain;
DWORD dwBytes;
char cBuffer[65535] = {0};
char *packet=NULL;
int io = 1;
int len=0;
LPTSTR szMsntalk;
#ifdef WIN32
WSAData ws;
WSAStartup(MAKEWORD(2,1),&ws);
#endif
sock = socket(AF_INET,SOCK_RAW,IPPROTO_IP);
#ifdef WIN32
if(sock==SOCKET_ERROR) ExitProcess(0);
#else
if(sock==0)exit(-1);
#endif
sain.sin_family = AF_INET;
sain.sin_port = htons(6000);
sain.sin_addr.S_un.S_addr = inet_addr(argv[1]); // interfaces[argv[1]];
printf("Binding on interface... \n");
bind(sock,(SOCKADDR*)&sain,sizeof(sain));
WSAIoctl(sock,SIO_RCVALL,&io,sizeof(io),NULL,0,&dwBytes,NULL,NULL);
printf("Using WSAIoctl\n");
struct tcpheader *pTCPHeader;
struct ipheader *pIPHeader;
pIPHeader = (struct ipheader *)cBuffer;
pTCPHeader = (struct tcpheader *)(cBuffer + sizeof(struct ipheader));
printf("\nSniffing TCP packet's...\n");
while(1)
{
memset(cBuffer,0,sizeof(cBuffer));
recv(sock,cBuffer,sizeof(cBuffer),0);
len =(ntohs(pIPHeader->ip_len)-(sizeof(struct ipheader)+sizeof(struct tcpheader)));
if((pIPHeader->ip_p==IPPROTO_TCP)&&(len!=0)){
packet = (char *)&cBuffer[sizeof(struct ipheader)+sizeof(struct tcpheader)];
char *pointer,*pointer1,*pointer3;
if((pointer=strstr(packet,"MSG")) && (pointer1=strstr(packet,"text/plain"))) {
ExtractPacket(pointer1);
printf("\nSniffing Messenger Messages\n");
}
}
}
}
return 0;
}
int main(int argc, char *argv[])
{
int sockfd, portno, n;
struct sockaddr_in serv_addr;
struct hostent *server;
char buf[256];
if (argc < 4) {
fprintf(stderr,"usage %s hostname port\n", argv[0]);
exit(0);
}
portno = atoi(argv[3]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
char *name=NULL;
int namelen = strlen(argv[1]);
name=(char*)malloc(namelen+1);
memset(name,0,namelen+1);
memcpy(name,argv[1],namelen);
name[namelen] = '\0';
//printf("name here is %s\n",name);
if (sockfd < 0)
{
error("ERROR opening socket\n");
exit(0);
}
server = gethostbyname(argv[2]);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
exit(0);
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,(char *)&serv_addr.sin_addr.s_addr,server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0)
{
error("ERROR connecting\n");
exit(0);
}
//int i,nbytes,j;
printf("\n********* Connected to the Server *********** \n");
//if connect successful send JOIN msg to server
short int typejoin =2; //set msg type as JOIN
char *buffer=NULL;
short int attype = 2; //attribute type=2 for username
n = MakePacket(typejoin,attype,&buffer,name);
//change the length of the data to be sent
//printf("Packet Done \n");
if (send(sockfd, buffer,n, 0) == -1) perror("error in sending JOIN MSG\n");
fd_set readSet,master_list_read;
FD_ZERO(&master_list_read);
FD_SET(STDIN, &master_list_read);//stdin manually trigger reading
FD_SET(sockfd, &master_list_read);//tcp socket
struct timeval tv;
int retval;
tv.tv_sec = 10;
tv.tv_usec = 0;
while(1)
{
char *buffer=NULL;
int n;
tv.tv_sec = 10;
readSet=master_list_read;
retval = select(sockfd+1, &readSet, NULL, NULL,&tv);
if (retval == -1)
{
perror("Error in select\n");
exit(4);
}
else if(retval==0)
{
if(!idlesend)
{
buffer=NULL;
short int typeidle =9; //set msg type as SEND
short int attuname = 2; //attribute type=2 for username
sprintf(buf,"%s",name);
n =MakePacket(typeidle,attuname,&buffer,name);
printf("!! Going Idle !!\n");
idlesend=true;
if (send(sockfd, buffer,n, 0) == -1)
perror("error in sending MSG to server\n");
//printf("*********SEND SUCCESSFUL******\n");
//free(buffer);
}
}
else
{
if(FD_ISSET(0, &readSet))
{
idlesend=false;
bzero(buf,256);
fgets(buf,256,stdin);
//buf[512]='\0';
/*for(i=0;i<5;i++)
printf("byte[%d]: %c \n",i,buf[i]);*/
short int typesend =4; //set msg type as SEND
short int attmsg = 4; //attribute type=4 for message
int n =MakePacket(typesend,attmsg,&buffer,buf);
if (send(sockfd, buffer,n, 0) == -1) perror("error in sending MSG to server\n");
//printf("*********SEND SUCCESSFUL******\n");
//free(buffer);
}
else if (FD_ISSET(sockfd, &readSet)) // receives data from server,print it on StdOutput
{
bzero(buf,256);
int nbytes = recv(sockfd, buf, 256,0);
if(nbytes<=0)
{
perror("recv error from server \n");
exit(0);
}
ExtractPacket(buf);
}
} //END OF ELSE
} //end of while
close(sockfd);
return 0;
}
